Repairing auxiliary heater -D5W- Z (supplementary heater) — VW
Repairing auxiliary heater -D5W- Z (supplementary heater) on VW: factory workshop procedure. Full factory text, tools and checks.
Workshop procedure for VW — the factory write-up, straight from real workshop data.
📋 Procedure
Repairing auxiliary heater -D5W- Z (supplementary heater)
Note
Before starting electrical welding work on the vehicle, disconnect the positive pole from the battery and connect it to earth in order to protect the
heater control unit
J162
.
A manufacturer's plate is attached to the heater unit. This plate provides information about the type of heater unit installed in the vehicle
Fig.
.
The heater unit of the -D5W- Z has the same structure as the heater unit of the -D5W- S
Chapter
.
Before every repair, please read out the fault memory of the control unit
vehicle diagnostic, testing and information system
VAS 5051A
.
Check the coolant circuit after working on it.
Components identified with
*
are checked by the self-diagnosis function.
Metering pump
V54
*
Installation position: in front of fuel tank on the right
Removing and installing
Chapter
Fuel supply to auxiliary heater
Chapter
.
Heater unit
*
With
heater control unit
J162
Removing and installing
Chapter
Dismantling and assembling
Chapter
Exhaust system
Removing and installing
Chapter
Securing silencer to heater unit
Chapter
Coolant hoses
Coolant hose routing; connecting auxiliary heater to coolant circuit
Chapter
.
Ambient temperature switch
F38
Switch position -On- at temperatures lower than approx. 10 °C.
Check switch positions with
vehicle diagnostic, testing and information system
VAS 5051A
in
“Guided fault finding”
function
Removing
Fig.
Checking
Chapter
Manufacturer's plate
Note
The most important technical data are shown on upper part of manufacturer's plate.
Only the 25 2163 version for -D5W- Z is factory-fitted in the Sharan 06.2000 ▸.
The heat exchanger for the auxiliary heaters does not have to be renewed after 10 years. Legislation in Germany dictates only that air heaters must be renewed.
Removing
ambient temperature switch
F38
Unclip
ambient temperature switch
F38
1
from holder on left in plenum chamber.
Note
In vehicles from model year 10.1998, the wiper motor must also be replaced
Rep. Gr.
92
.
Check
ambient temperature switch
F38
Chapter
.
TorqFix answers live for your specific car — tell it the engine code and it serves the matching sequence, torque figures and wiring for that exact variant.
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Who makes these pages, and how
TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.
The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.
Variants of the same model differ. Cross-check torque against the factory manual for your engine before final tightening.
Seen a figure that does not match your manual? Write to us — we correct it and note when. support@torqfix.com
The story behind TorqFix →Workshop data on this page last updated 20 Sep 2026.